2013, 01-10 Duct Leakage AffidavitEnergy Code
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WASH INGTON STATE UNIVLRSITY
151 EXTENSION ENERGY PROGRAM
Duct Leakage Affidavit
Permit #:
House address or lot number: I cS
City: S����, r r f Zip:
Cond. Floor Area (ft2): \ 300
Source (circle one): Plans) Estimated Measured
0 Duct tightness testing is not required for this residence per exceptions listed at the end of this document
Air Handler in conditioned space? 0 yes 2 no Air Handler present during test? 0 yes 0 no
Circle Test Method: Leakage to Outside Total Leaka
Maximum duct leakage:
Post Construction, total duct leakage: (floor area x .08) = CFM@25 Pa
Post Construction, leakage to outdoors: (floor area x .06) = CFM@25 Pa
Rough -In, total duct leakage with air handler installed: (floor area x .06) = 78 CFM@25 Pa
Rough -In, total duct leakage with air handler not installed: (floor area x .04) = CFM@25 Pa
Test Result: CFM@25Pa
Ring (circle one if applicable): (Open
Duct Tester Location: M G >^,.
Pressure Tap Location: �; �, y.,u h IZ Nkl
I certify that these duct leakage rates are accurate and determined using standard duct testing protocol.
Company Name:
Technician Signature:
Technician:
(2;V" V) 4. I2 u S5�
Date: )//0/13 Phone Number: ape) - lO 6 0- bpi I
Washington State Energy Code reference:
503.10.3 Sealing. All ducts, air handlers, filter boxes, and building cavities used as ducts shall be sealed. Joints and seams shall comply
with Section M1601.3 of the International Residential Code or 603.9 of the Intemational Mechanical Code. Duct tightness testing shall be
conducted to verify that the ducts are sealed. A signed affidavit documenting the test results shall be provided to the jurisdiction having
authority by the testing agent. When required by the building official, the test shall be conducted in the presence of department staff.
Exceptions: 1. Duct tightness test is not required if the air handler and all ducts are located within conditioned space.
2. Duct testing is not required if the fumace is a nondirect vent type combustion appliance installed in an unconditioned space.
A maximum of six feet of connected ductwork in the unconditioned space is allowed. All additional supply and retum ducts
shall be within the conditioned space. Ducts outside the conditioned space shall be sealed with a mastic type duct sealant and
insulated on the exterior with R-8 insulation for above grade ducts and R-5 water resistant insulation when within a slab or
earth.
Duct Testing Calculator New Construction)
House addressor lot #:
Conditioned Floor Area:
Duct tester location:
Pressure tap location:
Ring (if applicable):
15 S Con
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Oper$I 1 0 2 ❑ 3 0
At Rough -in (Total Leakage)
Test Method
Standard'
Calculated
Target
Test2
CFM25
Air Handler Present
<_ 6 CFM25 per 100 sf of CFA
1CI1
1
5_4CEIVL25--pe 'Q0-sf-aLCEA
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Air Handler not resent
Post Construction
Test Methodr-----...........„._Standard1
Calcu .ted
arget
Test2
CFM25
Air Handler Present (Total
Leakage)
_ FM25 per 100 sf of
Air Handler Present
(Leakage to Exterior)
<_ 6 f 25 per 100 s FA
1. Test results must comply with one of the Standards options.
2. Test CFM25 must be equal to or less than the calculated target.
Air Leakage testing Calculator (Blower Door Test
Standard
Tested CFM50
Test Result (SLA)
0.00030 SLA ((CFM50x
0.055) / (CFA X 144))
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Glossary
Rough -In: After installation of the complete air distribution system but before installation of insulation and
sheet rock. Allows for access to all duct seams and connections for re-evaluation of seal integrity if standard
is not met in intitial test.
Post Construction: At or near final inspection. The home must be complete enough to pressurize the home
to 25 pa.
Total Leakage: Aggregation of the entire systems duct leakage in a duct test.
Leakage to Exterior: Aggregation of all duct system leaks to the exterior of the CFA in a duct test.
CFA: Conditioned floor area
CFM25: Cubic feet per minute of air leakage at 25 pascals of pressure
CFM50: Cubic feet per minute of air leakage at 50 pascals of pressure
Pascal (pa): Unit of pressure
SLA: Specific leakage area i c
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